HP Improvement Question

[6Turbo6]

I have a stock 87 GN, what I am wondering is if I do a 3" DP with test tube and ATR 3" kit, how much horsepower do you think I will pick up? I am pretty new to messing with Buicks. Or what would anyone recomend I do first. I would like to have the car run 13 o's or a little better maybe. Please point me in the right direction

 

[Red Regal T]

ALCOHOL INJECTION.........GOOD FOR 5 TENTHS. GO TO ALKY SECTION.

 

[bruce]

Originally posted by 6Turbo6
I have a stock 87 GN, what I am wondering is if I do a 3" DP with test tube and ATR 3" kit, how much horsepower do you think I will pick up? I am pretty new to messing with Buicks. Or what would anyone recomend I do first. I would like to have the car run 13 o's or a little better maybe. Please point me in the right direction

Get a scanner, and learn to understand the engine, then read read read, and then start mods.

 

[UNGN]

First thing you need to do is put the ATR catalog away.

Go to Gnttype.org and check out the recipes page. Its a little dated, but then so are our cars.

The stock downpipe with a $20 used test pipe (or a gutted cat) will run within a .1 a $400 3" downpipe, deep into the 11's if you have a good exhaust and a ported turbo elbow.

 

[Buick Beginner]

WAIT STOP!!

Don't do anything just yet, just like UN-GN said. Start doing your research first. Take your time, get a scan tool, and then add one piece at a time. If you're like me the first thing you want to do is GO FAST! But, by going slow and taking your time you will go fast and LAST LONGER, without picking up engine pieces from the pavement. - BB

 

[6Turbo6]

Ok ordered up a scanmaster. The car has been in storage for 4 years so the exhaust is shot, I really need to get a system for it, what is the hands down best way to go. I can afford to spend the cash but just want to get what is best for the car. So let see what you guys think is the best system I should get. I have searched the posts and it varys in opinion what everyone says. I just sent a flowmaster system back to summit after reading about that kit.

 

[JoeNational]

Ok well right now i have 3" thdp with the dumper since i love noise i leave the dumper open in the streets but i will be getting this system. for a whole "legal" system i would say go 3" ATR with pitbulls, but it also depends how fast you want to go , but like everybody said first learn these cars because let me tell you i read for years before i got one i still no nothing lol..

 

[murphster]

One thing to consider is if you have to pass emissions or not. You may need a system where you can replace a a gutted cat or test pipe with a good cat in order to pass emissions, so keep that in mind.

With money not a consideration, I think a lot of people would say a 3" Terry Houston downpipe and the ATR 3' dual stainless steel exhaust are one of the better systems out there for exhaust. I'm not sure what the cat options for the Houston downpipe are, as I have one without a cat and a dump on the GN.

Besides the scan tool, other first mods to consider are an aftermarket boost gauge, an upgraded fuel pump, adjustable fuel pressure regulator and fuel pressure gauge, an adjustable wastegate rod, and a chip. There are some other basic mods you can do that are cheap too. With all of these and some good tires you'll be having fun. Read the spring cleaning and recipes on gnttype.org too.

-murph